How do I use API to create persons?

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API

Python2.7

I am trying to use Face++ api to put image onto their site to be used as a webservice. The problem I am facing is all the face properties can be shown when running in cmd but when I try to create the persons with specific face_id it keeps giving me an error as shown below.

<pre lang="xml">"error": "INVALID_ARGUMENTS: face_id does not exist",
"error_code": 1005

Is there anything missing in my codes? This are the codes where the person will be created and where the error is triggered.

for name, face in FACES.iteritems():
    rst = api.person.create(
            person_name = name, face_id = face['face'][0]['face_id'])
    print_result('create person {}'.format(name), rst)

If anyone has any solution or advice,please help.